html,
body {
    height: 100%;
}

.mui-content {
    height: 100%;
    display: flex;
    background-color: #eeeeee;

    .main-left {
        width: 100px;
        position: relative;

        li {
            height: 50px;
            line-height: 50px;
            text-align: center;
            background-color: #fff;
            border-bottom: 1px solid #ccc;
            border-right: 1px solid #ccc;

            &.active {
                background-color: #eee;
            }
        }
    }

    .main-right {
        flex: 1;
        position: relative;

        ul {
            margin: 10px;
            background-color: #fff;
            display: flex;
            flex-wrap: wrap;

            li {
                width: calc(100% / 3);
                text-align: center;
            }
        }
    }
}